Appearance: Sebastian has thick dark brown hair that he keeps slicked back. His eyes are a dark green that appear to be brown in certain lights. Although he normally keeps a clean shaven face, he sometimes lets his facial hair grow out into a slight beard and mustache. He is tall, standing at 6'0" and he has impeccable posture. He has very proud features and a muscular form, but his greatest feature is his endearing smile.

Style: Like his younger brother, Sebastian also wears fine and expensive clothing. However, he doesn't necessarily love suits and ties, he has just worn them so much for the sake of appearances that they have now become a permanent part of who he is. Underneath his suits, Sebastian always wears suspenders.

Accessories: He wears a wristwatch identical to his brothers'. He also has a pair of black leather gloves that he wears frequently. Other than that, he carries the necessary tools of any business man such as a briefcase, ballpoint pen, and his beloved day planner.